Photo display system is easy to change, without putting holes in wall. Decorated by Anne Turner Carroll and Katherine Cobbs. Photo by Jason Bernhaut for Cottage Living. I can combine this idea with those magnetic photo wires
Chalkboard paint with a layer of magnetic paint underneath. Frames were painted and affixed to the wall with velcro (so they can be removed but little hands can't knock them off). Love the idea of Velcro on chalkboard wall.